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发明名称
Appareil électrique indicateur d'une différence de fréquence
摘要
申请公布号
FR994215(A)
申请公布日期
1951.11.14
申请号
FRD994215
申请日期
1949.08.30
申请人
THE GENERAL ELECTRIC COMPANY LIMITED
发明人
分类号
G08C19/12
主分类号
G08C19/12
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代理人
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